Volume 116, Number 3, November 2016
|Number of page(s)||6|
|Section||Condensed Matter: Electronic Structure, Electrical, Magnetic and Optical Properties|
|Published online||09 December 2016|
Self-hole-doping–induced superconductivity in KCa2Fe4As4F2
College of Physics and Information Engineering, Henan Normal University - Xinxiang, Henan 453007, PRC
Received: 18 October 2016
Accepted: 23 November 2016
The electronic structure, magnetism, Fermi surface nesting, and bare susceptibility of the superconductor KCa2Fe4As4F2 are discussed in relation to the Fe-pnictide superconductors based on the first-principle calculations. There are ten bands crossing the Fermi level in the nonmagnetic (NM) states, resulting in six hole-like Fermi surface (FS) sheets along the line and four electron-like FS sheets along the line. It is more complicated than other FeAs-based superconductors, showing multi-bands character. Fixed spin moment calculations and the total energies of different magnetic phase indicate that KCa2Fe4As4F2 has a strong tendency towards magnetism, i.e., the stripe antiferromagnetic state. But the self-hole-doping suppressed the spin-density wave state, and then induced superconductivity in the parent compound. Such self-doping strategy may be used for future exploration of new superconductors.
PACS: 74.70.-b – Superconducting materials other than cuprates / 74.25.Jb – Electronic structure (photoemission, etc.) / 74.25.Ha – Magnetic properties including vortex structures and related phenomena
© EPLA, 2016
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